The nucleon axial charge from lattice QCD with controlled errors

S. Capitani; M. Della Morte; G. von Hippel; B. Jäger; A. Jüttner; B. Knippschild; H. B. Meyer; H. Wittig

doi:10.1103/PhysRevD.86.074502

The nucleon axial charge from lattice QCD with controlled errors

S. Capitani, M. Della Morte, G. von Hippel, B. Jäger, A. Jüttner, B. Knippschild, H. B. Meyer, H. Wittig

Johannes Gutenberg University

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value.

Original language	English
Article number	074502
Journal	Physical Review D
Volume	86
ISSN	2470-0010
DOIs	https://doi.org/10.1103/PhysRevD.86.074502
Publication status	Published - 1. May 2012
Externally published	Yes

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10.1103/PhysRevD.86.074502

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title = "The nucleon axial charge from lattice QCD with controlled errors",

abstract = " We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value. ",

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T1 - The nucleon axial charge from lattice QCD with controlled errors

AU - Capitani, S.

AU - Morte, M. Della

AU - Hippel, G. von

AU - Jäger, B.

AU - Jüttner, A.

AU - Knippschild, B.

AU - Meyer, H. B.

AU - Wittig, H.

PY - 2012/5/1

Y1 - 2012/5/1

N2 - We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value.

AB - We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value.

KW - hep-lat

KW - hep-ph

KW - nucl-th

U2 - 10.1103/PhysRevD.86.074502

DO - 10.1103/PhysRevD.86.074502

M3 - Journal article

SN - 2470-0010

VL - 86

JO - Physical Review D

JF - Physical Review D

M1 - 074502

ER -

The nucleon axial charge from lattice QCD with controlled errors

Abstract

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